.centers{
	text-align: center;
}
.black{
	color: #D3D3D3;
}
.padding{
	padding: 5px 15px 5px 15px;
}
.size{
	font-size: 14px;
}
html,body{
	height: 100%;
}
#app{
	height: 100%;
	width: 100%;
	display: flex;
	flex-direction: column;
}
header,footer{
	height: 46px;
	line-height: 46px;
	text-align: center;
	background-color: red;
}
section{
	flex: 1;
	overflow-y: scroll;
}